In a large mixing bowl, whisk the yeast, sugar, and warm water. Set aside for 10 minutes, until it's foamy on top. (If it's not foamy, check your yeast packet, as it might be expired.)
Mix the olive oil and vanilla extract into the foamy yeast mixture.
Add the flour, pumpkin pie spice, and salt and mix for a minute with a large wooden spoon or silicone spatula until it forms a soft, sticky dough.
Cover the mixing bowl with plastic wrap or a kitchen towel for 30 minutes.
Stretch and Fold 1: Use your hand to scoop a handful of dough from underneath, up one side, up out of the bowl as far as you can stretch it without tearing, then fold it over itself on top. Rotate the bowl 90 degrees and repeat another stretching of the dough up and folding over itself. Repeat rotating the bowl and stretching & folding the dough twice more, until you've completed four stretch-and-folds.
Cover the mixing bowl with plastic wrap or a kitchen towel for 30 minutes.
Stretch and Fold 2: Repeat the process for four stretch-and-folds. Cover the mixing bowl with plastic wrap or a kitchen towel for 30 minutes.
Stretch and Fold 3: Repeat the process for four stretch-and-folds. Cover the mixing bowl with plastic wrap or a kitchen towel for 30 minutes.
Stretch and Fold 4: Repeat the process for four stretch-and-folds.
Cover the mixing bowl with plastic wrap or a kitchen towel for 1 hour until it doubles in size and looks bubbly on top.